美国密执根大学医疗系统的专家们提示各位家长注意以下事项（The University of Michigan Health System says parents should be on the lookout for these warning signs of infant pain）:

1、孩子的面部表情/Facial expressions, including grimacing, furrowing the brow, squeezing eyes shut, opening the mouth or having deep lines form around the nose.

2、高调而持久的哭闹/A high-pitched, insistent cry that lasts longer than usual, although some very sick babies may be too weak to cry at all.

3、全身肌肉张力或动作异常/Stiffness throughout the body, or flailing and squirming. Some very sick or premature babies may appear limp.

4、行为异常/Behaving irritably and not responding to comforting or feeding.

5、饮食或睡眠不佳/Not eating or sleeping.